本文实例讲述了Yii框架实现的验证码、登录及退出功能。分享给大家供大家参考，具体如下：

捣鼓了一下午，总算走通了，下面贴出代码。

Model

<?phpclass Auth extends CActiveRecord {  public static function model($className = __CLASS__) {    return parent::model($className);  }  public function tableName() {    return "{{auth}}";  }}

注：我的用户表是auth，所以模型是Auth.php

<?phpclass IndexForm extends CFormModel {  public $a_account;  public $a_password;  public $rememberMe;  public $verifyCode;  public $_identity;  public function rules() {    return array(      array("verifyCode", "captcha", "allowEmpty" => !CCaptcha::checkRequirements(), "message"=>"请输入正确的验证码"),      array("a_account", "required", "message" => "用户名必填"),      array("a_password", "required", "message" => "密码必填"),      array("a_password", "authenticate"),      array("rememberMe", "boolean"),    );  }  public function authenticate($attribute, $params) {    if (!$this->hasErrors()) {      $this->_identity = new UserIdentity($this->a_account, $this->a_password);      if (!$this->_identity->authenticate()) {        $this->addError("a_password", "用户名或密码不存在");      }    }  }  public function login() {    if ($this->_identity === null) {      $this->_identity = new UserIdentity($this->a_account, $this->a_password);      $this->_identity->authenticate();    }    if ($this->_identity->errorCode === UserIdentity::ERROR_NONE) {      $duration = $this->rememberMe ? 60*60*24*7 : 0;      Yii::app()->user->login($this->_identity, $duration);      return true;    } else {      return false;    }  }  public function attributeLabels() {    return array(      "a_account"   => "用户名",      "a_password"   => "密码",      "rememberMe"  => "记住登录状态",      "verifyCode"  => "验证码"    );  }}

注：IndexForm也可以写成LoginForm，只是系统内已经有了，我就没有替换它，同时注意看自己用户表的字段，一般是password和username，而我的是a_account和a_password

Controller

<?phpclass IndexController extends Controller {  public function actions() {    return array(      "captcha" => array(        "class" => "CCaptchaAction",        "width"=>100,        "height"=>50      )    );  }  public function actionLogin() {    if (Yii::app()->user->id) {      echo "<div>欢迎" . Yii::app()->user->id . "，<a href="" . SITE_URL . "admin/index/logout">退出</a></div>";    } else {      $model = new IndexForm();      if (isset($_POST["IndexForm"])) {        $model->attributes = $_POST["IndexForm"];        if ($model->validate() && $model->login()) {          echo "<div>欢迎" . Yii::app()->user->id . "，<a href="" . SITE_URL . "admin/index/logout">退出</a></div>";exit;        }      }      $this->render("login", array("model" => $model));    }  }  public function actionLogout() {    Yii::app()->user->logout();    $this->redirect(SITE_URL . "admin/index/login");  }}

注：第一个方法是添加验证码的

view

<meta http-equiv="content-type" content="text/html;charset=utf-8"><?php$form = $this->beginWidget("CActiveForm", array(  "id"            => "login-form",  "enableClientValidation"  => true,  "clientOptions"       => array(    "validateOnSubmit"   => true  )));?>  <div class="row">    <?php echo $form->labelEx($model,"a_account"); ?>    <?php echo $form->textField($model,"a_account"); ?>    <?php echo $form->error($model,"a_account"); ?>  </div>  <div class="row">    <?php echo $form->labelEx($model,"a_password"); ?>    <?php echo $form->passwordField($model,"a_password"); ?>    <?php echo $form->error($model,"a_password"); ?>  </div>  <?php if(CCaptcha::checkRequirements()) { ?>  <div class="row">    <?php echo $form->labelEx($model, "verifyCode"); ?>    <?php $this->widget("CCaptcha"); ?>    <?php echo $form->textField($model, "verifyCode"); ?>    <?php echo $form->error($model, "verifyCode"); ?>  </div>  <?php } ?>  <div class="row rememberMe">    <?php echo $form->checkBox($model,"rememberMe"); ?>    <?php echo $form->label($model,"rememberMe"); ?>    <?php echo $form->error($model,"rememberMe"); ?>  </div>  <div class="row buttons">    <?php echo CHtml::submitButton("Submit"); ?>  </div><?php $this->endWidget(); ?>

同时修改项目下protected/components下的UserIdentity.php

<?php/** * UserIdentity represents the data needed to identity a user. * It contains the authentication method that checks if the provided * data can identity the user. */class UserIdentity extends CUserIdentity{  /**   * Authenticates a user.   * The example implementation makes sure if the username and password   * are both "demo".   * In practical applications, this should be changed to authenticate   * against some persistent user identity storage (e.g. database).   * @return boolean whether authentication succeeds.   */  public function authenticate()  {    /*    $users=array(      // username => password      "demo"=>"demo",      "admin"=>"admin",    );    if(!isset($users[$this->username]))      $this->errorCode=self::ERROR_USERNAME_INVALID;    elseif($users[$this->username]!==$this->password)      $this->errorCode=self::ERROR_PASSWORD_INVALID;    else      $this->errorCode=self::ERROR_NONE;    return !$this->errorCode;    */    $user_model = Auth::model()->find("a_account=:name",array(":name"=>$this->username));    if($user_model === null){      $this -> errorCode = self::ERROR_USERNAME_INVALID;      return false;    } else if ($user_model->a_password !== md5($this -> password)){      $this->errorCode=self::ERROR_PASSWORD_INVALID;      return false;    } else {      $this->errorCode=self::ERROR_NONE;      return true;    }  }}

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希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。